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how can I identify Limestone?

Subject: how can I identify Limestone?
by steve. on 7/6/2011 12:04:54

I am in the process of building a new pond and have been given lots of decent sized plants. The only problem is they float, I cant remember the name of the plants but they are tall and have yellow flowers.

I have weighed the plants down with large stones but now worried it may be limestone which I gather is bad for fish or maybe its sandstone?

Does anyone know how I could identify it?

Maybe when I get home I could post pic's for you guys too look at :D